Forbes estimates O'Leary's personal fortune at $1.1bn (€890m). I'm sure his annual Gigginstown Angus bull sales contributed to that.

Those who say there's no money in cattle will point to his other sources of income. Of course, there are the racehorses. Oh, and a few Ryanair shares.

Having said that, O'Leary ranks only 1,999th in the global billionaire league. Maybe there isn't so much money in cattle after all.

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